Deaerating of feed water for boilers



April 14, 1931. J. SIM 1,801,178

DEAERATING OF FEED WATER FOR BOILERS Filed Oct 6. 192a JZmes Jim INVENIOR w 1%, mam

AT ORNEY Patented Apr. 14, 1931 UNITED STATES um em, or oa'rncaar, emseomsoomnn, assrenoa re a. a m or carxcaar, enaseow, sconmn PATENT: OFFICE Lnrrran.

num'rme or man warm iron Bonus Application fled October 6, 1928, Serial Io. 810,888, and in Great Britain lprvenber 1!, 1m.

The present invention consists in a method of and apparatus for de-aerating feed water for boilers. The object of the invention is to provide for eflicient de-aeration at modw erate cost.

The method according to the invention is as follows:

1. A de-aerating chamber is provided. The water to be treated is admitted t6 this 1g chamber and, after de-aeration, is withdrawn from it. The separated air iswithdrawn from the chamber, and the chamber maintained at a suitable pressure (vacuum).

2. The water to be treated is divided into n two portions.

l 3. The one portion-the major portion-4s heated before admission to the de-aerating chamber. The other portion is left unheated.

4. The admission of both portions'tc the 20 de-aerating chamber=is controlled in accordance with the water level in that chamber.

5. The unheated portion is sprayed into the tie-aerating chamber.

6. The heated portion is admitted to the $5 de-aerating chamber at a temperature higher than that corresponding to the pressure (vacuum) within that chamber, so that a portion of it will flash into vapour on admisslon.

7. The admission of the two portions is so arranged that the vapounobtained from the flashing. of the heated .portion is subjected to the spray from the unheated portion.

The carrying of the invention into efiect in one convenient manner will be described; and the invention will be defined in the annexed claims.

' The accompanying diagrammatic drawing illustrates the carrying of the invention into eflect in one convenient m'anner.

a is a pipe through which is supplied the water to be de-aerated. The major portion of this water is admitted through the pipe I) to the tank or heater in which it is heated by any suitable means, e. g. by direct contact with exhaust steam. From this tank or heater the heated water passes by the pipe (1 to the de-aerating chamber 0. Its admission to this chamber is controlled by the valve 9. The

unheated portion of the water passes to the de-aerating chamber by the pipe f. Its admission to this chamber is controlled by the valve 70.. Both valves are controlled by a float it according to the water level in the de-aerating chamber. Each valve might be controlled by an independent float; but the employment of a single float is convenient an effective.

It is generally desirable that the heated portion of, the water be several times as great as the unheated fortion. In the present example the heate portion constitutes 80% of the whole. The valves g and h are so arranged that the ratio of quantity between the two portions, that is, four to one in the pres- ,ent example, is maintained approximately constant at any position of the valves be-. tlween full closed position and full open posi- The water is withdrawn from the de-aerating chamber by the pump m and passed through the ejector condenser n which is of the surface t The water is then delivwithdrawn from the e-aerating chamber through the pipe r by a steam-jet air-ejectorp. The steam of the et and the vapour withdrawn with the air are condensed in the elector condenser n. The air is discharged t rough the pipes, while the water drains back b the pipe t into the de-aerating chamber. e air-withdrawi means are arranged to maintain a suite. le PIGSSUIG (vacuum) within the de-aerating chamber. The heated portion of the feed-water" is arranged to enter the de-aeratin chamber. at a temperature appreciably hig (er-say to Fahr. higher-than that corresponding to the pressure (vacuum) within the chamber so that on admission it tends to flash into steam, and a portion of it does do this. The unheated portion of the feed water is admitted to a chamber u provided at the top of the de-aerating chamber. Nob zles or spraying devices 11 are arran at the bottom of this chamber so that thlSPOT- tion of the feed water enters the de-aerating chamber in the form of spray. The arrangement for the entry of the heated portion of the feed water to the de-aerating chamber is such that the steam produced by the flashing of the water onentering the de-aerating chamber is subjected to this spray. An effective means of liberating the air and condensing theflashed steam is thus provided.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. The method of de-aerating water consisting in maintaining a reduced pressure in a de-aeratin chamber, separatin the water to be treate into two rtions, eating one portion of the water prior to its admission in the chamber, leaving the remaining portion of the water unheated, admitting in the chamber the unheated portion of the water in a spray, separately admitting the heated portion of the water. in the chamber at a temperature higher than that corresponding to the reduced pressure in said chamber whereby a part of the heated portion of the water will flash on admission, subjecting the flashing from the heated portion of the water-,to the spray of the unheated portion or the water, and controlling the admission of both portions of the water by the water level in the chamber.

2. The method of de-aeratin water consisting in maintaining a reduce pressure in a de-aerating chamber, separating the water to be treated into two unequal portions, heating the larger rtion of the water prior to its admission in the chamber, leaving the smaller portion of the water unheated, admitting in the chamber the unheated portion of the water in a spray, separately admitting the heated portion of the water in the chamber at a-temper-aturehigher than that corresponding to. the reduced pressure in said chamber whereby a part of the heated portion of the waterwill flash on admission, subjecting the flashing from the heated rtion of the water to the spray of the un-' eated portion of the water, and controlling the admission of both portions of the water i. by the water level in the chamber.

3. The method of de-aerating water consisting in maintaining a reduced pressure in a de-aerating chamber, separating the water to be treated into two unequal portions, one

of the portions of the water constituting 75 to 85 per cent of the whole, heating this latter portion of the Water prior to its admis- S1011 i n the ,de-aerating chamber, leaving the remaining portion of the water unheated,

, admitting in the chamber the unheated portion of the water in a spray, separately admitting the heated portion of the water in the chamber at a temperature higher than that corresponding to the reduced pressure in said chamber whereby a part of the heat-' ed portion of the water will flash onadmis.

sion, subjecting the flashing: from the heated port1on of the water to the spray of the unneonate heated portion of the water, and controlling the admission of both portions of the water by the water level in the chamber.

4. The method of de-aerating water consisting in maintaining a reduced pressure in a de-aerating chamber, separating1 the water to be treated into two portions, eating one portion of the water prior to its admission in the chamber, leavin the remaining portion of the water unheate admitting in the chambr the unheated portion of the water in a spray, separately admitting the heated portion of the water in the chamber at a temperature from '20 to 30 degrees Fahrenheit higher than that correspondin to the reduced pressure within the chem r whereb a part of the heated portion of the water wi lflash on admission, subjecting the flashing from the heated portion of the water to the sion in the de-aeratin chamber, leaving the remaining portion 0 the water unheated, admitting in the chamber the unheated portion of the water in a spray, separately admitting the heated portion of the water-in the chamber at a temperature from 20 to 30 degrees Fahrenheit higher than that corresponding to the reduced ressure within the c amber whereby at art 0 the heated portion of the water W11]. ash on admission, subjecting the flashing from the heated portion of the water to the spray of the unheated portion of the water, and controlling the admission of both portions of the water by the water level in the chamber.

6. The method of de-aeratin water consisting in maintaining a reduce pressure in a de-aeratin chamber, separatin the water to be treat into two portions, eating one portion ofthe water prior to its admission maining portion of the water unheated, admitting in the chamber the unheated portion of the water in a spray separately admitting the heated portion of the water in the chamber at a temperature higher than-that corresponding to the reduced pressure in said 0 amber whereby a part of'the heated portion of the water will flash on admission, subjecting the flashing from the heated portion of the water to the spray of the unheated portion of the water to liberate the air and vapors therefrom, withdrawing the liberated air and vapors from the chamber, condensing the vapors, and reutrning the condensate to the chamber for admixture with the water in the latter.

7. The method of de-aerating water con- 7 sisting in separating the water to be treated into two portions, heating one portion of the water prior to its admission to the de-aeratin chamber, leaving the remaining portion 0 the water unheated, admitting in the chamber the unheated portion of the water in a spray, separately admitting the heated portion of the water in the chamber and causin a part of said heated water to flesh on a mission in the chamber, subjecting the flashing from the heated portion of the water to the spray of the unheated portion of the water to liberate the air and vapors therefrom, withdrawing the liberated air and vapors from the chamber, condensing the vapors and returning the condensate to the chamber for admixture with the water in the latter.

I hereby sign my nameto this specification.

JAMES SIM. 

